Add an "高级 (Advanced)" menu after "其他 (Other)" whose
"远程桌面质量等级 (Remote Desktop Quality Levels)" item opens a dialog to
edit the six preset QualityProfile levels (max FPS, max width, codec
algorithm, bitrate). The dialog edits a working copy in a full grid with
per-field validation and a restore-defaults button; on OK it persists the
values to the [quality] INI section.
The server stays authoritative: LoadQualityProfilesFromCfg loads the saved
levels at startup (falling back to GetQualityProfile defaults), and
ScreenSpyDlg now sends CMD_QUALITY_PROFILES from GetQualityProfileCfg so
new remote-desktop sessions transmit with the configured parameters. Added
en_US/de_DE/zh_TW translations for the menu and dialog strings.
Co-Authored-By: deepseek-v4-pro
Add German as the fourth selectable UI language. The new de_DE.ini mirrors
en_US.ini with byte-identical Chinese keys (2028 lines, zero missing
translations, zero key mismatches), so it passes CheckEncoding and appears in
the language list automatically. German values are pure-ASCII transliterations
(ae/oe/ue/ss) because the GBK/CP936 architecture cannot encode umlauts.
LangManager.h now maps de_DE to the display name "Deutsch". Also translated the
seven Chinese value==key gaps that en_US itself left untranslated.
Co-Authored-By: deepseek-v4-pro
